Seaglider data

Level 1

Time series of a few basic variables, including temperature, salinity,
pressure, and time of the observations.  

Seaglider has a good flight model, which uses the vehicle engineering variables
as well as the water column observations (in-situ density) to calculate the
vehicle motion through the water. Our best guess of the vehicle position is
included here.  

Level 2

Same as time series data, but gridded on a regular depth. Value is NaN if no
observation is present in that depth bin.  

Level 3

Interpolated version of Level 2 data, with the additional step of "despiked",
where we remove data that are more than 2 standard deviations for a running
mean.  

Flags:
0 no data (interpolated), 0.5 outside despiker, 1 is good